US8714784B2 - LED lamp including light guide and method of reflecting light using same - Google Patents

LED lamp including light guide and method of reflecting light using same Download PDF

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US8714784B2
US8714784B2 US12/708,353 US70835310A US8714784B2 US 8714784 B2 US8714784 B2 US 8714784B2 US 70835310 A US70835310 A US 70835310A US 8714784 B2 US8714784 B2 US 8714784B2
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Prior art keywords
light
reflector
led
tapered cylinder
compound parabolic
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US20100208488A1 (en
Inventor
Hong Luo
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ABL IP Holding LLC
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Osram Sylvania Inc
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Priority to CN201310638079.6A priority Critical patent/CN103759224A/zh
Priority to CN201611112063.1A priority patent/CN106838667A/zh
Application filed by Osram Sylvania Inc filed Critical Osram Sylvania Inc
Priority to CN2010800081649A priority patent/CN102326022A/zh
Priority to CA2750537A priority patent/CA2750537C/en
Priority to US12/708,353 priority patent/US8714784B2/en
Priority to PCT/US2010/024613 priority patent/WO2010096578A1/en
Assigned to OSRAM SYLVANIA INC. reassignment OSRAM SYLVANIA INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LUO, HONG
Priority to KR1020117021832A priority patent/KR101698046B1/ko
Priority to EP10704881.1A priority patent/EP2399067B1/en
Priority to JP2011550327A priority patent/JP5526153B2/ja
Publication of US20100208488A1 publication Critical patent/US20100208488A1/en
Assigned to OSRAM SYLVANIA INC. reassignment OSRAM SYLVANIA INC. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: OSRAM SYLVANIA INC.
Publication of US8714784B2 publication Critical patent/US8714784B2/en
Application granted granted Critical
Assigned to ACUITY BRANDS LIGHTING, INC. reassignment ACUITY BRANDS LIGHTING, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OSRAM SYLVANIA INC.
Assigned to ABL IP HOLDING LLC reassignment ABL IP HOLDING LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ACUITY BRANDS LIGHTING, INC.
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/0091—Reflectors for light sources using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/61—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/66—Details of globes or covers forming part of the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0071—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source adapted to illuminate a complete hemisphere or a plane extending 360 degrees around the source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/68—Details of reflectors forming part of the light source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/041—Optical design with conical or pyramidal surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • F21Y2115/15—Organic light-emitting diodes [OLED]

Definitions

  • the present invention relates to lighting, and more specifically, to lighting devices incorporating solid-state lighting technology.
  • Solid-state lighting technology including light emitting diodes (LEDs)
  • LEDs light emitting diodes
  • LEDs and/or other solid state lighting components generate a large amount of heat that must be dissipated through use of a thermal management system (e.g., a heat sink).
  • a thermal management system e.g., a heat sink
  • this thermal management system is realized by mounting the LED/LEDs on a metallic, opaque pedestal that protrudes into the bulb.
  • the pedestal transfers heat away from the LEDs, but results in a conventional B10 retrofit lamp looking very different from a conventional B10 incandescent lamp.
  • Embodiments of the present invention overcome the various issues discussed above with regards to conventional B10 retrofit lamps. That is, embodiments as described herein provide an optical design that creates an emission pattern that gives a sparking appearance, similar to that of a conventional incandescent B10 lamp.
  • One or more light-emitting diodes LEDs
  • LEDs light-emitting diodes
  • the light emitted by the LED/LEDs is guided by total internal reflection through a light pipe to a reflector that directs the light into a desired emission pattern.
  • the light pipe is comprised of a transparent material such as acrylic plastic.
  • the reflected light from the reflector appears to be emitted from a point suspended within the envelope of the lamp, much like a conventional B10 incandescent bulb.
  • an LED lamp in an embodiment, there is provided an LED lamp.
  • the LED lamp includes a transparent light pipe enclosed in an envelope, wherein the light pipe has a lower section and an upper section.
  • the LED lamp also includes an LED in a recess at a lower end of the lower section of the light pipe, and a reflector formed by an indentation in an upper end of the upper section of the light pipe.
  • the lower section of the light pipe collects light emitted from the LED, the upper section of the light pipe directs the collected light onto the reflector, and the reflector reflects the directed light in a radial direction.
  • the reflector may have a surface of revolution defined by a multi-part curve, wherein a first part of the multi-part curve may have a radius of a first length, a second part of the multi-part curve may have a radius of a second length, and the first length and the second length may be different.
  • the first part of the multi-part curve, in relation to the second part of the multi-part curve may have a greater component in a vertical direction to reflect more light in an up direction.
  • the second part of the multi-part curve, in relation to the first part of the multi-part curve may have a greater component in a horizontal direction to reflect more light in a down direction.
  • the surface of revolution may be formed by a Bézier curve.
  • the reflector may be formed by metallization of an outer surface of the indentation or by filling the indentation with a white material or by ultrasonic welding of an injection molded white part to the indentation.
  • the lower section of the light pipe may be a compound parabolic concentrator (CPC), wherein the compound parabolic concentrator may collimate the light emitted from the LED.
  • the upper section of the light pipe may be a tapered cylinder that narrows towards the upper end of the light pipe, wherein the tapered cylinder may direct the collimated light from the compound parabolic concentrator to the reflector.
  • the tapered cylinder may be defined in part by a taper angle, wherein an increase in the taper angle may result in a more intense reflection of light by the reflector, and wherein a decrease in the taper angle may result in a less intense reflection of light by the reflector.
  • the tapered cylinder may be defined in part by a cylinder length, and wherein an increase in the cylinder length may result in an increase of light emitted through a side of the tapered cylinder.
  • the envelope may be in the shape of a conventional B10 incandescent bulb.
  • the light pipe, the LED, and the reflector may be sized such that the light pipe is able to fit within the conventional B10 incandescent bulb-shaped envelope.
  • a light guide for an LED lamp includes a compound parabolic concentrator having a lower end and an upper end, wherein the lower end is located nearest to an LED; a tapered cylinder having a wide end and a narrow end, wherein the wide end is coupled to the upper end of the compound parabolic concentrator; and a reflector, wherein the reflector is formed by an indentation at the narrow end of the tapered cylinder.
  • the compound parabolic concentrator and the tapered cylinder use total internal reflection to guide light emitted from the LED to the reflector, and the reflector reflects the guided light in a radial direction.
  • the compound parabolic concentrator may receive light emitted from the LED and collimate it, and the tapered cylinder may direct the collimated light from the compound parabolic concentrator towards the reflector.
  • the compound parabolic concentrator and the tapered cylinder may be transparent, and light may be emitted from an outer edge of both the compound parabolic concentrator and the tapered cylinder.
  • the reflector may have a surface of revolution defined by a multi-part curve, wherein a first part of the multi-part curve may have a radius of a first length, a second part of the multi-part curve may have a radius of a second length, and the first length and the second length may be different.
  • the compound parabolic concentrator, the tapered cylinder, and the reflector may all be sized so as to be able to fit within a conventional B10 incandescent bulb-shaped envelope.
  • a method of reflecting light emitted by an LED in a radial direction includes receiving light emitted from an LED; transmitting the received light to a reflector via total internal reflection through use of a compound parabolic concentrator coupled to a tapered cylinder; and reflecting the transmitted light in a radial direction with the reflector.
  • transmitting may include collimating the received light within the compound parabolic concentrator, and directing the collimated light within the tapered cylinder to the reflector.
  • reflecting may include reflecting, via a reflector defined by an indentation at a narrow end of the tapered cylinder, the transmitted light in a radial direction.
  • FIG. 1 shows a component view of an LED lamp including a light guide according to embodiments disclosed herein.
  • FIG. 2 shows a top view of the LED lamp including a light guide according to embodiments disclosed herein.
  • FIG. 3 shows a side view of a light guide according to embodiments disclosed herein.
  • FIG. 4 shows a side view of an LED lamp including a light guide and an envelope according to embodiments disclosed herein.
  • FIG. 5 illustrates a flowchart of a method performed by a light guide according to embodiments disclosed herein.
  • FIG. 1 shows component view of an LED lamp 100 , according to embodiments disclosed herein.
  • the LED lamp 100 includes an LED 102 and a light guide 200 .
  • the light guide 200 is formed from a light pipe 107 having a lower section 106 and an upper section 108 , and a reflector 112 .
  • the LED 102 is a single light-emitting diode, fixed on a chip or other substrate material, while in other embodiments, the LED 102 is comprised of a plurality of light-emitting diodes.
  • the phrase “light-emitting diode” or “LED” may include any type of solid-state light emitter, such as but not limited to conventional LEDs, organic LEDs (OLEDs), and the like.
  • the light pipe 107 has a base 104 .
  • the LED 102 sits within a recess 150 at a lower end 105 of the lower section 106 of the light pipe 107 .
  • the recess is preferably hemispherical, to reduce reflective losses, but may be of any suitable shape for containing an LED.
  • the LED 102 within the recess 150 is concealed in the base 104 of the light pipe 107 .
  • the base 104 may be flanged to provide for stability and ease of mounting.
  • a heat sink or other thermal management system or device forms part of the base 104 of the LED lamp 100 to direct heat away from the LED 102 .
  • the heat sink or other thermal management system may be fixed or otherwise coupled to the LED lamp 100 , but this is not required.
  • the reflector 112 is formed by an indentation 110 in an upper end 111 of the upper section 108 of the light pipe 107 .
  • the lower section 106 of the light pipe 107 collects light emitted from the LED 102 .
  • the upper section 108 of the light pipe 107 directs that collected light onto the reflector 112 .
  • the reflector 112 then reflects that directed light in a radial direction.
  • the reflector 112 is sufficiently small that it creates a sparkling appearance similar to the filament in an incandescent bulb.
  • the reflector 112 may take a variety of shapes depending on the curvature of the surface of the indentation 110 , which may also be referred to herein as a surface of revolution 113 . That is, the curvature of the surface of the indentation 110 (i.e., the surface of revolution 113 ) determines the curvature of the reflector 112 . Varying the curvature of the reflector 112 in this way results in the creation of different emission patterns suitable for different applications. For example, in some applications, it may be more desirable to have more forward emission, while it may be more desirable in a wall sconce application to have more side emission to illuminate the wall and ceiling for a wall-washing effect.
  • the surface of revolution 113 is conical in shape, resulting in a conical-shaped reflector.
  • the surface of revolution 113 may result in the reflector 112 having a curved-shape.
  • this curve shape may be a Bézier curve.
  • the surface of revolution 113 in some embodiments, is defined by a multi-part curve 130 .
  • the multi-part curve 130 has at least two parts.
  • a first part 131 of the multi-part curve 130 has a radius of a first length, while a second part 132 of the multi-part curve 130 has a radius of a second length.
  • These lengths may be of any size that results in the creation of a multi-part curve, such as the multi-part curve 130 shown in FIG. 1 , and in some embodiments, these lengths are different.
  • Varying the length of one or both parts of the multi-part curve 130 (by varying the surface of indentation 113 ) will result in changes to the emission pattern of the LED lamp 100 .
  • Each part of the multi-part curve 130 may be thought to have both a horizontal component and a vertical component, where the horizontal component is in a horizontal direction in relation to a center 125 (shown in FIG. 2 ) of the LED lamp 100 and the vertical component is in a vertical direction in relation to the center 125 of the LED lamp 100 .
  • increasing a vertical component of the first part 131 of the multi-part curve 130 will result in more light being reflected in a direction that is up, and axially out, in relation to the LED lamp 100 .
  • increasing a horizontal component of the second part 132 of the multi-part curve 130 will result in more light being reflected in a direction that is down, and axially out, in relation to the LED lamp 100 .
  • the reflector 112 may be formed in any known way.
  • the reflector 112 may be an injection molded part that is ultrasonic welded to the indentation 110 in the light pipe 107 .
  • the indentation 110 may be filed with a white-colored material to form the reflector 112 .
  • an outer surface of the indentation 110 may be coated with a reflective material, such as but not limited to silver, resulting in the metallization of the outer surface of the indentation 110 .
  • the light pipe 107 has a lower section 106 and an upper section 108 .
  • the lower section 106 in some embodiments, is a compound parabolic concentrator (CPC).
  • CPC compound parabolic concentrator
  • the compound parabolic concentrator collimates the light emitted from the LED. That is, the angle of emission of light at the LED 102 is different from the angle of emission at the top of the compound parabolic concentrator (i.e., where the compound parabolic concentrator meets the upper section 108 of the light pipe 107 ).
  • the shape of the outer edge of a vertical cross section of the compound parabolic concentrator is parabolic, that is, shaped like a parabola. The width of the compound parabolic concentrator thus depends on the rate of rise of each side of the parabola.
  • the upper section 108 of the light pipe 107 is, in some embodiments, a tapered cylinder.
  • the tapered cylinder directs the collimated light from the lower section 106 /compound parabolic concentrator to the reflector 112 .
  • the tapered cylinder narrows from the lower section 106 /compound parabolic concentrator towards the upper end 111 of the light pipe 107 . This tapering causes the collimated light to be directed to the reflector 112 .
  • the tapered cylinder is, in some embodiments, defined in part by a taper angle.
  • the taper angle is the angle between an outer edge of a vertical cross section of the tapered cylinder and a vertical line drawn from the point at which the tapered cylinder and the compound parabolic concentrator meet.
  • the tapered cylinder is, additionally or alternatively, defined in part by cylinder length.
  • the cylinder length is the measurement of the height of the tapered cylinder, from the point at which the tapered cylinder and the compound parabolic concentrator meet to the uppermost edge of the tapered cylinder where it meets the reflector 112 .
  • An increase in the length of the tapered cylinder results in an increase of light emitted through a side of the tapered cylinder.
  • the light pipe 107 is enclosed in an envelope 190 , such as is shown in FIG. 4 .
  • the light pipe 107 is, in some embodiments, transparent.
  • the light pipe 107 may be, in whole or in part, semi-transparent or translucent. Further, in some embodiments, the entirety or part of the light pipe 107 may be surrounded by a transparent, semi-transparent, translucent, or opaque material, or combinations thereof.
  • the light pipe 107 may be made of a dialectic material, such as but not limited to acrylic.
  • the envelope 190 may be of any shape, and in some embodiments, the envelope 190 is in the shape of a conventional B10 incandescent bulb (e.g., a candelabra shape).
  • the envelope 190 also encompasses the LED 102 (not shown in FIG. 4 ), the base 104 , and the reflector 112 .
  • the light pipe 107 , the LED 102 , and the reflector 112 are all sized such that they are able to fit within the envelope 190 .
  • the light guide 200 is shown in more detail in FIG. 3 .
  • the light guide 200 includes a compound parabolic concentrator 202 (equivalent to the lower section 106 of the light pipe 107 shown in FIG. 1 , and possessing all of the properties described above with regards to FIG. 1 ), a tapered cylinder 204 (equivalent to the upper section 108 of the light pipe 107 shown in FIG. 1 , and possessing all of the properties described above with regards to FIG. 1 ), and reflector 206 (equivalent to the reflector 112 shown in FIG. 1 , and possessing all of the properties described above with regards to FIG. 1 ).
  • the compound parabolic concentrator 202 has a lower end 210 and an upper end 212 .
  • the lower end 210 is located nearest to an LED (not shown in FIG. 3 ).
  • the tapered cylinder 204 has a wide end 214 and a narrow end 216 .
  • the wide end 214 is coupled to the upper end 212 of the compound parabolic concentrator 202 .
  • the reflector 206 is formed by an indentation at the narrow end 216 of the tapered cylinder 204 .
  • the combination of the compound parabolic concentrator 202 and the tapered cylinder 204 use total internal reflection to guide light emitted from the LED to the reflector 206 .
  • the reflector 206 then reflects the guided light in a radial direction. More specifically, the compound parabolic concentrator 202 receives light emitted from the LED and collimates it, and the tapered cylinder 204 directs the collimated light from the compound parabolic concentrator 202 towards the reflector 206 .
  • the compound parabolic concentrator 202 and the tapered cylinder 204 are transparent.
  • light is emitted from an outer edge 114 (shown in FIG. 2 ) of both the compound parabolic concentrator 202 and the tapered cylinder 204 (i.e., the light pipe 107 ).
  • light is emitted from an outer edge 114 (shown in FIG. 2 ) of only the tapered cylinder 204 , or from an outer edge 114 (shown in FIG. 2 ) of only the compound parabolic concentrator 204 .
  • the compound parabolic concentrator 202 and the tapered cylinder 204 may each be: transparent; semi-transparent; translucent; surrounding by a material that is transparent, semi-transparent, translucent, or opaque, or a combination of these; or a combination of any of these.
  • the light guide 200 is encompassed within an envelope, such as but not limited to a conventional B10 incandescent bulb-shaped envelope.
  • the compound parabolic concentrator 202 , the tapered cylinder 204 , and the reflector 206 are all sized so as to be able to fit within the envelope.
  • FIG. 5 shows a flowchart of a method performed by the LED lamp 100 shown in FIG. 1 and/or the light guide 200 shown in FIG. 3 .
  • the method results in light emitted by an LED, such as the LED 102 shown in FIG. 1 , being reflected in a radial direction.
  • a reflector e.g., element 112 shown in FIG. 1
  • the received light is then transmitted to a reflector (e.g., element 112 shown in FIG. 1 ) via total internal reflection through use of a compound parabolic concentrator (e.g., element 106 shown in FIG. 1 ) coupled to a tapered cylinder (e.g., element 108 shown in FIG. 1 ), step 502 .
  • a reflector e.g., element 112 shown in FIG. 1
  • a compound parabolic concentrator e.g., element 106 shown in FIG. 1
  • a tapered cylinder e.g., element 108 shown in FIG. 1
  • transmitting may include collimating the received light within the compound parabolic concentrator, step 504 , and directing the collimated light within the tapered cylinder to the reflector, step 505 .
  • reflecting may include reflecting, via a reflector defined by an indentation at a narrow end of the tapered cylinder, the transmitted light in a radial direction, step 506 .
  • the indentation 110 at the end of the upper section 108 of the light pipe 107 /tapered cylinder 204 has: a smooth surface, in which case light emitted by the LED 102 is transmitted via total internal reflection; or a rough surface, in which case light emitted by the LED 102 is scattered at the indentation 110 ; or a combination thereof (for example, a first portion of the indentation has a smooth surface while the remaining portion of the indentation may has a rough surface).

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Planar Illumination Modules (AREA)
US12/708,353 2009-02-18 2010-02-18 LED lamp including light guide and method of reflecting light using same Active 2032-07-14 US8714784B2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
KR1020117021832A KR101698046B1 (ko) 2009-02-18 2010-02-18 Ｌｅｄ들， 광 가이드， 및 반사기를 갖는 광원
CN2010800081649A CN102326022A (zh) 2009-02-18 2010-02-18 具有led、光导和反射器的光源
CA2750537A CA2750537C (en) 2009-02-18 2010-02-18 Light source with leds, light guide and reflector
US12/708,353 US8714784B2 (en) 2009-02-18 2010-02-18 LED lamp including light guide and method of reflecting light using same
PCT/US2010/024613 WO2010096578A1 (en) 2009-02-18 2010-02-18 Light source with leds, light guide and reflector
CN201611112063.1A CN106838667A (zh) 2009-02-18 2010-02-18 具有led、光导和反射器的光源
CN201310638079.6A CN103759224A (zh) 2009-02-18 2010-02-18 具有led、光导和反射器的光源
EP10704881.1A EP2399067B1 (en) 2009-02-18 2010-02-18 Light source with leds, light guide and reflector
JP2011550327A JP5526153B2 (ja) 2009-02-18 2010-02-18 Ｌｅｄ、ライトガイド及び反射器を具備した光源

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EP2399067A1 (en) 2011-12-28
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CN103759224A (zh) 2014-04-30
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CA2750537A1 (en) 2010-08-26
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